title: In vitro action of human and porcine alpha-amylases on cyclomalto-oligosaccharides.
abstract: The vitro action of human and porcine pancreatic alpha-amylases on cyclomalto-oligosaccharides (cyclodextrins) was investigated both by a high-performance liquid chromatographic analysis and a quantitative analysis of the reducing power of cyclodextrin hydrolyzates. Cyclomalto-octaose (gamma-cyclodextrin) was hydrolyzed to produce mainly maltose, but cyclomalto-hexaose and -heptaose were little affected both by human and porcine alpha-amylases. Quantitative analysis of reducing power revealed that the ring-opening rate of gamma-cyclodextrin catalyzed by human pancreatic alpha-amylase was 2.8 times slower than that catalyzed by the porcine enzyme. The number of multiple attacks on gamma-cyclodextrin and its inhibitor constants for human pancreatic alpha-amylase and porcine pancreatic alpha-amylase were almost the same.
authors.affiliation: Department of Food Science and Technology, Faculty of Agriculture, Kyoto University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Kondo
authors.forename: H
authors.initials: H
authors.lastname: Nakatani
authors.forename: K
authors.initials: K
authors.lastname: Hiromi
mesh_terms: D000818:Animals; D002384:Catalysis; D003505:Cyclodextrins / Q000378:metabolism*; D006801:Humans; D006868:Hydrolysis; D007700:Kinetics; D010179:Pancreas / Q000201:enzymology; D012463:Saliva / Q000201:enzymology; D013045:Species Specificity; D013552:Swine; D000516:alpha-Amylases / Q000378:metabolism*
chemical_list: D003505:Cyclodextrins; D000516:alpha-Amylases